Mining-machine



(No Model.) 3 Sheets-Sheet 1. C. 0. PALMER. MINING MACHINE.

v (No Model.) 3 Sheets- Sheet 2.

C. O. PALMER. MINING MACHINE.

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ANDREW xaximmm4 PriTO-LITHU. WASHINGIGN. D C

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[No Model.) 3 Sheets-Sheet 3.

C. O. PALMER.

MINING MACHINE.

No. 557,340. Patented Mar.31 ,1896.

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lo C H 127 INDREN B GFAHAM.PNUTU-UTMWASHINGTDNC.

UNITED STATES nPATENT OFFICE.

CHARLES O. PALMER, OF CLEVELAND, OHIO.

MINING-MACHINE.

SPECIFICATON forming part 0f Letters Patent No. 557,340, dated March 31, 1896.

Application led February 8, 1892l Serial No. 420,742. (No model.)

T0 all whom t may concern;

Be it known that I, CHARLES O. PALMER, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Mining-Machines, of which the following is a specication.

My improvements relate, first, to the described means for supporting the revoluble cutter-bars and to the mechanism for revolving them; second, to the mechanism for vibrating the cutter-bars longitudinally,whereby the bars cut the coal in front of their outer bearing; third, to the employment of revolv ing conveyers having a longitudinal vibratory movement, whereby the debris made` by the cutter-bars is removed from the kerf, and to the slanting apron on the cutter-bar frame, which facilitates the removal of said debris; fourth, to the mechanism for transmitting power from a fixed motor to the moving machine; iifth, to the mechanism for feeding the entire machine forward; sixth, to the method of guiding the machine in its forward movement parallel to the working breast, and to the means whereby the machine during its movement across and parallel to the working breast automatically forms a groove adapted to guide the machine during the succeeding feed movement in the same direction, and to the means carried by the machine for engaging with said groove; seventh, to the rudder mechanism for preventing. the de'liection of the cutter-bar frame out of its intended plane of travel; eighth, to the method and means for entering and leaving the cut, and, finally, to the combination andl arrangement of parts intended to simplify and strengthen the machine and to better adapt it for its intended purpose, all of which will be hereinafter explained, and pointed out definitely in the claims.

In the drawings, Figure 1 is a top view of the machine with the forward parts of the cutter-bar frame andA cutter-bars cut away. Fig. 2 is a side elevation of the entire machine when engaged in undercutting a vein of coal or other material. Fig. 3 is a vertical sectional View on the line 3 3 in Fig. 1. Fig. 4

is a section on the line 4 l of Fig. 1, showing the relative arrangement of certain drivinggears to be hereinafter explained.

Fig. 5 is a top view of the machine with the top plate 119 and all the parts mounted thereon removed. Fig. 6 is a longitudinal section on the line 6 6 of Fig. 1. Fig. 7 is a Vertical sectional View on the lines 7 7 in Fig. 5, and Fig. 8 is a vertical sectional view on line 8 S in the same figure. Fig. 9 is a vertical sectional view on line 9 9 of Fig. 1, showing the feeding mechanism. Fig. 10 is a plan view, partly in section, of the driving-gear and the swivel-bearing by which the same is supported at and in its proper relation to the motor. Fig. 11 is a side view, partly in section, of the mechanism shown in Fig. 10. Fig. 12 is a detail of the guide-block, showing a plan view, a side view, and an end view of the same. Fig. 13 is a detail of the brace extending between said guide-block and the main frame. Fig. 14 is a top planview of the machine, the motor, and the connecting mechanism and the room in which the said machine is being operated, and illustrates the path traveled 'by the machine during one complete undercut.

Referring now to the drawings, D denotes the main frame of the machine, which consists of a bottom plate 128, the top plate 119, and the channel-irons 127, which lie between said plates, the whole being secured together by bolts 129. The forward end of the bottom plate rests upon the floor of the room in which the machine is being operated, While the top plate supports most of the driving mechanism, to be described. Between the said top and bottom plates and' extending therefrom lies the longitudinally-movable cutter-bar frame C, from the forward end of which extend the two arms .27 and 30, and secured to said arms in the bracket 5 and to the outer end of the arm 30 is fastened the bracket 15. These arms 27 and 30 (forward extensions of the frame) support the forward ends of the cutter-bars, which are journaled in the brackets 5 and 15, respectively, and also serve to support the other movable parts of the appa ratus which extend into the kerf.

The cutter-bar A, which is journaled in the frame C, has its forward end journaled in the bracket 5. A second cutter-bar, B, lying substantially parallel to the cutter-barA, is journaled in the frame C, and also in brackets 5 and 15, above referred to. Asclearly shown IOO in the drawings, the cutter-bar B extends considerably farther forward than does the cutter-bar A, and said forward part of said cutter-bar is provided with suitable cutters, whereby this eutter-bar B is adapted to eX- tend, beneath the vein, the kerf made by the cutter-bar A. Behind the cutter-bar A and substantiallyparallel with it is the screw conveyer 19, which is attached to a shaft 11 journaled in the frame C and having an inde pendent longitudinal movement in said bear ings,as hereinafter explained. Another screw couveyer, 17, is arranged behind the cutterbar B and attached to the shaft 13, which is j ournaled in the frame C, and, like the shaft 1l, has a limited longitudinal play in its bearings. The purpose of these screw conveyers is to remove the debris formed by the cutterbars with which they are associated to a point on the slanting apron 24 ofthe cutter-bar frame outside of the kerf, and from there it is swept away by brushes as fastas it accumulates thereon.

The cutter-barA, which moves in advance of the cutter-bar B, cuts a certain distance beneath the vein, and the cutter-bar B increases the depth of said cut a distance equal to the distance which it extends beyond the end of the cutter-bar A. The cutter-bars A and B and eonveyers 10 and 17 are adapted to be revolved by mechanism to be hereinafter described.

To the top plate 119 is bolted a standard 115. Passing vertically through and journaled in said standard is the main shaft 7 0 havin g a bevel-gear 71 keyed to its lower end and a bevelgear 47 keyed to its upper end and held lin place by the nut 07. Meshing with the bevel-gear 7l. is the bevel-gear 72, which is keyed to a longitudinal shaft 73. This shaft is j ournaled in bracket 7-1, supported on the plate 110, and in bracket 77 secured to the cutter-bar frame. As the frame C is vibrated the bearing-bracket 77 slides longitudinally on the shaft 73. Keyed to said shaft 73 are the pinions 75 and 7G. Pinion 7 0 meshes with gear S5, which in turn meshes with gear S0. Gear S meshes with gears 2 and 10, which are respectively keyed to the shaft of the cutter-bar A and to the shaft 11 of its screw eonveyer 10. Pinion 75 meshes with gear S0, which in turn meshes with gears 12 and 20, which gears are keyed to cutterbar B and to the shaft 1S of its associated conveyer 17. The gear S is supported on shaft 7 0, and the gear SG is supported on shaft 01, both of which shafts are mounted in bearings in the brackets SS) and 77, which are secured to the cutter-bar frame C. The gear S0 is revolubly mounted on the stud 90 projecting from bracket SS. The gears above described constitute a train of gearing the particular function of which is to transmit motion from the vertical shaft 70 to the two cutter-bars and their screw conveyers, and it will be seen that as the shaft 70 is revolved the cutter-bars are revolved in opposite directions.

On the shaft 70 is the gear 78, which meshes with gear 100 on the shaft 101. The gear 100 meshes withthe gear 102 on the shaft 103. The shafts 101 and 103 are supported in suitable bearings in the standard 115. The shaft 103 is held in place by the nut 10i on its upper end, while to its lower end is secured the eccentric 106. Surrounding the eccentric is the eccentric-strap 107. This eccentric-strap is connected, by means of the pin S, to the cutter-bar frame C. On the bottom of the eccentric 10G is the crank-pin 110, and a eonnecting-rod 111 is pivoted at one end to said crank-pin and at its other end to a pin 112 on the saddle 113. The said saddle 113 slides on and is guided by the frame C and has depending from its extremities the yokes 125 and 120, which lic between collars 121 and 130 upon the conveyer-shafts 11 and 18, respectively, as shown in Figs. 3 and 5.

As the shaft 103 is revolved the eccentric 10G at its lower end and the eccentric-strap 107 cause the cutter-bar frame, and consequently the eutter-bars carried thereby, to vibrate longitudinally. The purpose of this longitudinal vibration of the frame C is, first, to reciprocate the cutter-bars so as to enable the cutters on said bars to cut the coal in front of their bearings in the brackets 5 and and also to impart to the conveyors a slight longitudinal reciprocating motion. In addition to the longitudinal motion given the cutter-bars by the vibrating frame C the eonveyers are given an additional and independent longitudinal reciprocating motion. This is done by the crank-and-pitman connection between said shaft 103 and the saddle 113 and the described engagement of the saddle-yokes between the collars on the shafts 11 and 18 of the screw conveyers. A longitudinal vibratory or reciprocating motion given the conveyers adds greatly to their ca pacity, as was found by experiment. The movable cover 117 is to facilitate oiling the eccentric and other accessible parts under the top plate 110.

Secured upon the top plate 110, and to one side thereof, is a winding-drum or capstan. This consists of a standard 1.57 which is fastened to said top plate by suitable bolts 152. The winding-drum 151 is mounted upon this standard, and is also provided with a wormwheel 150 on its lower flange. The drum is kept on its standard by the bolt 151, washer 15G, and nut 155. The worm-whecl150 is actuated by the worm 14:0 on shaft The said shaft 132 is supported in bearings in the pieces 1113 and 142, which are secured to the top plate 119. A ratehet-wheel 135 is keyed to the wormshaft 132. Loosely pivoted on the outer end of the shaft is a bell-crank lever 131. A pawl 133 is pivotally connected to one end of the bell-crank lever 131, and in such a position, substantially as shown in IOO IIO

Fig. 9, that it is adapted to engage with the ratchet-wheel 135. The lower end of the bellcrank 131 lits over a pin 130, which is secured to the frame C. A second pawl136 is pivotally connected with the bracket 138 on the bracket 89, which is fastened to the frame C and is likewise adapted to engage with the ratchet-wheel 135.

It is evident from the foregoing description t-hat as the frame C is vibrated it causes the slow revolution of the winding-drum 151, for as said frame C moves outward between the plates of the main frame the pawl136 causes the ratchet 135 to revolve in the direction indicated by the arrow in Fig. 9. Vhen the frame C moves backward, the pawl 133 engages with the ratchet-wheel and causes its movement in the same direction. The revolution of the ratchet-wheel135 causes the revolution of the Worm-shaft 132, which revolution is transmitted to the capstan lby the construction described. 'Ihe rate of feed may be diminished by throwing either of the pawls 133 or 136 out of engagement with the ratchet-wheel 135, or it may be entirely stopped by throwing them both out of engagement. When this is done, any rate of feed desired may be obtained by means of the hand-wheel 145.

In the beginning, to make a eut beneath a vein the machine is placed in the left side of the room, facing to the working breast of the vein, substantially such as is shown by the dotted lines at the left of Fig. 14. A jackscrew is then passed vertically through the hole 124 in the right side of the frame of the machine and screwed firmly against the roof of the room, and thus it serves as a pivot about which the machine is made to. turn. A chain or cable 181 attached to the capstan passes over sheaves 164, which are mounted on the corners of the frame. It is then carried and secured to a jack-screw placed at any suitable position-as, for example, at 182.

Vhen now the vertical shaft is made to revolve by any suitable motor, the cutter-bars -are revolved, as heretofore explained. At the same time the winding-drum 151 revolves, winding up the chain 181. This causes the entire machine to be swung upon the center 124, whereby the cutter-bars cut their way underneath the vein until the machine has reached the position shown by the full lines at the left of Fig. 14. The machine is now in position to be moved along parallel to the working breast. The j ack-screw to which the end of the chain 181 is secured is now moved to a point 183, when said chain will lie substantially parallel to the working breast, and the jack-screw at 124 is removed. As the chain is wound upon the capstan the entire machine is moved, and the machine is guided by any fixed guide. -Usually in machines of this class a track is secured to the floor, and the machine is guided by said track. To avoid the necessity of laying a track to guide the machine during each. movement across the working breast, I provide means whereby the machine, during each' complete undercut, forms in the floor of the room a groove which is adapted to serve as a guide for the next feed movement, and I fix to the machine a guide-block having suitable tongues or their equivalents, which are adapted to engage in said groove.

On the side of one of the cutter-bars-as, for example, the bar B-I fix one cutter 21, which projects a greater distance than do the others; and it is evident that this cutter will form the groove 22 in the floor. In beginning the use of this machine upon any vein of coal it is desirable that a straight groove 22 be iirst cut parallel to the working breast.

After one lguiding-groove is cut the machine automatically cuts the grooves for the succeeding feed movements. Secured to the under side of some rigid connection of the main frame of the machine are tongues adapted to enter this groove and thereby guide the machine; but since the tongues arenot employed during the swinging movement of the machine, as before described, these tongues are formed on a guide-block which is so connected with the machine as to be easily removable.

In Fig. 12 a removable guide-block is shown in the form of a bar WV, having a pin 175, which fits into a hole in either ear 120 or 122, secured to the opposite sides of the machine. The bar W has a brace R, one end of which, 179, is adapted to pass through a hole 178 in the bar, and it extends to the end of the frame, where its end 171 ts in the ear 170 on said frame. Tongues 176 are formed on the under side of the bar W, which tongues, as before stated, enter the groove 22 and serve to guide the machine and to hold it so that the cutter-bars remain substantially perpendicular to the breast of the coal. When the machine has been swung to the position shown in the full lines at the left of Fig. 14, the bar W is connected to the right side of the machine in the manner just described. The machine is then fed along in the described manner, and the tongues 176 in the groove guide said machine in a path parallel to the working breast. Before the tongues on the outer end of the bar W have reached the curved part of the groove 22 the feed is stopped and said bar is removed from its described position and similarly connected to the opposite left side of the machine, as shown at the right of Fig. 14, and the described feed movement continued. Vhen the machine has reached the position shown in solid lines at the right side of the room, (see Fig. 14,) the bar W is disconnected from the machine, a jack-screw is passed through the hole in the left side of main frame at 172, the chain 181 is passed around the sheaves 164, and its end is connected with a jack-screw fixed at a suitable point, as at 184. When the machine is again started, the chain is wound upon the capstan and the machine swings about the center 172 and the cutter-bars cut IOO IIO

their way out from under the vein to the position shown by the dotted lines at the right of Fig. 14.

Any sort of a motor which may be connected by any suitable means with the machine heretofore described may be employed to furnish power for operating the same. l have shown in the drawings an electric motor N, which drives a vertical shaft 50, on the upper end of which is keyed a bevel-gear 51. The power is transmitted from this bevel-gear to the bevel-gear 47, heretofore referred to, by means of the shaft 53 and the bevel-gears 60 and 52 secured thereto, which engage, respectively, with the bevel-gears 47 and 51. In order that this power may be continued to be transmitted duringthe entire movement of the machine it is necessary to provide means for holding said bevel-gears 52 and 60 in meshing relation with the bevel-gears 5l and 47, respectively, and also means whereby the said shaft shall remain in operative connection with both gears 52 and 60, while the distance between said gears is constantly varying. This last-named effect may be produced by making a tongue-and-groove connection between the shaft and one gear, whereby the shaft is slidable through the same. I prefer to make this sort of connection between the shaft and the gear 52, which meshes with the gear 51 on the motor-shaft. The swivel-bearing for each end of the shaft 53 is the same. The only difference in the arrangement of the mechanism at the ends is that the shaft 53 is slidable through the bearing at the motor end thereof, but is not so slidable through the bearing at the other end. The bevel-gears on the horizontal shaft are kept from sliding on the shaft by different means, as will be hereinafter explained.

The swivel-bearing consists of two parts (see Figs. 10 and 11) 56 and 57, which are pivoted together on a horizontal pin 59. The part 56 is provided with a vertical oriiice, through which passes the upper end of the vertical shaft 50, on which the bearing is held by the nut 94. A coil-spring 93 surrounds said shaft 50 and thrusts against a shoulder in the form of a nut 94 on the end of said shaft and the part 56 of the bearing, whereby the said bearing is held down and the gear 52 held in mesh with the gear 51. The other part, 57, has a substantially horizontal oriiice, in which the shaft 53 is journaled. Bolts 5S screw through the horizontal bearing 57 and pass through curved slots 43 in the vertical bearing 56, whereby the two parts of the bearing are held in contact with each other, but are permitted to swivel on the pin 59. The horizontal pivotal connection between the two parts of the bearing permits the shaft 53 to swing `up or down slightly from the horizontal position, whereby it remains operative when by reason of any unevenness of the iioor the relative planes of the gears 51 and 47 are altered. The dotted lines 44 above the swivel-bearing j ust described indicate the shaft inclines in the opposite direction.

position which said bearing will occupy when the shaft 53 inclines downward from the motor to the machine. The dotted lines 45 indicate the position of said bearing when the The face of the teeth on the horizontal bevelgears 47 and 51 are slightly convex, as shown, whereby the proper meshing of the said teeth with the gears 52 and 60 is insured in all of the various positions of the shaft 5l. The mounting of said bearing on a vertical pivot (the upper end of the shaft) permits the shaft to follow the movement of the machine before explained, and the sliding of the shaft through one of its bearings and the bevelgear adjacent thereto permits it to accommodate itself to the difference in distance between the machine and motor.

A yoke 54 adjacent to the end of the shaft, which is slidable through its bearing, is pivoted to said bearing by means of the bolts 55, which lie in the same axial line with the pin 59 and by which the two parts of thebearing are pivoted together. The said yoke passes outside of the gear 52 and thus prevents it from sliding away from its proper relation with the gear 51.

At the outer corners of the main frame are the leveling-screws 160, which screw into the corner-blocks 161, which corner-blocks form the bearings for the grooved sheaves 164 heretofore mentioned. The leveling-screws are turned by sprocket-wheels 166, which are splined to said screws. The sprocket-wheels and the screws to which they are attached are moved simultaneously by the link belt which passes around said sprocket-wheels. 'These leveling-screws are the means with which I raise or lower the rear end of the machine, and thus change the inclination of the cutterbars within reasonable limits.

By the employment of two cutter-bars, arranged as shown and described, instead of one, as has been common with this class of machines, I secure these distinct advantages, to wit: For a given amount of power used I am able to use cutter-bars of smaller diameter than I could if I relied on one cutter-bar adapted to cut as far beneath the vein as do the two in my machine. l can do this because the power, and consequently the strain, applied to each one is much less than the power and the strain would be on one adapted to cut an equal depth under the vein. By using cutter-bars of smaller diameter a narrower kerl' can be cut than could be cut with a single cutter-bar. Consequently by using two cutter-bars a kerf of any depth can be cut with a smaller expenditure of power than would be possible if one cutter-bar were employed.

In machines where only one cutter-bar is used the reaction of the coal against the cutters tends to raise or lower the cutter-bar, depending upon the direction in which it revolves; but by the use of two cutter-bars revolving in opposite directions this tendency described and is equalized, as is more fully IOO IIO

claimed in my other application, Serial No. 420,743, filed February 8, 1892.

If during the advance of the machine one of the cutter-bars strikes a part of the vein which is harder or softer than the average, there will be a tendency on the part of the cutter-bars to deflect the frame C out of its plane of travel. In order to counteract this tendency, I provide a rudder 32, by means of which the direction of travel of the frame C may be guided. This rudder is keyed to a shaft 31, which shaft is journaled at one end to the forward extension 15 of the frame C and at the other end in a bearing 34 on the side of the main frame D. The forward bearing of this shaft is loose, whereby it may slide on the shaft as the frame C vibrates. An arm 36 is rigidly secured to shaft 31 near its rear end, and to its upper end is connected a rod 33, which extends across the machine. The end of this rod is threaded and passes through nut 41 in hand-wheel 40 and is journaled in a bracket 39 secured to the top plate 119. By means of this hand-wheel, rod, and arm the shaft 3l may be rocked so as to throw the rudder against the top or bottom of the kerf, as desired. If pressed against the upper wall, it throws the frame C downward. If pressed against the lower wall, it throws said frame upward. And since this rudder may be operated while the machine is in motion it is possible to guide the cutter-bars in the desired plane of travel.

Having thus described my invention, what I claim as new, and desire to secure byLetters Patent, is

1. In a mining-machine, in combination, a cutter-bar frame, two parallel cutter-bars journaled in said frame and projecting an unequal distance therefrom, each cutter-bar having a series of radial cutters which project from its side, the cutters on the longer bar being on that part thereof which projects beyond the shorter bar, means for simultaneously revolving said cutter-bars, and means for moving said frame in a direction transverse to the axis of the cutter-bars, whereby when said frame is moved as described, to wit, with the shorter bar in advance, the shorter cutter-bar in revolving cuts a kerf beneath the coal and the longer cutter-bar deepens said kerf, substantially as set forth.

2. In a mining-machine, a cutter-bar frame,

having two bars of unequal length projecting y therefrom, each carrying a bearing-bracket in its outer end, two cutter-bars of unequal length journaled respectively at their inner ends in said frame, and at their outer ends in said brackets, and mechanism for revolving said cutter-bars, substantially as set forth.

3. In a mining-machine, a cutter-bar, and suitable means for supporting and revolving the same, combined with a screw conveyer in the rear of said cutter-bar, means for revolving the said conveyer, and mechanism for periodically imparting to said conveyer a longitudinal vibratory movement, substantially as and for the purpose specified.

4. In a mining-machine, a cutter-bar frame, a revoluble screw conveyer journaled thereon having longitudinal play in its bearings, combined with a shaft having a crank-arm, a saddle engaging with the conveyer-shaft, and a connecting-rod attached at its ends respectively to the crank-arm and saddle, whereby the conveyer is vibrated longitudinally in its bearings as the said crank-shaft is revolved, substantially as set forth.

5. In a mining-machine, a longitudinallyvibrating cutter-bar frame, and means for vibrating the same longitudinally, combined with a revoluble cutter-bar journaled on said frame, a revoluble screw conveyer also journaled on said frame and having longitudinal play in its bearings, mechanism for revolving said cutter-bar and conveyer, and mechanism for periodically imparting to said conveyer an independent longitudinal vibratory motion, substantially as and for the purpose specified.

6. In a mining-machine, in combination', a vertical driving-shaft, a bevel-gear 5l iiXed thereon, a shaft-bearing consisting of a part 56 which is swiveled upon said dri ving-shaft, and a part 57 which is pivoted on a horizontal pivot to said part 5G, a horizontal shaft journaled in said part 57, a bevel-gear 5l, a motor, and Amechanism for making and maintaining an operative connection between said horizontal shaft and motor while the mining-machine is moving from one position to another, substantially as and for the purpose specified.

7. The combination of a motor, a horizontal connecting-shaft driven thereby, a miningmachine having rotary cutter-bars projecting from the end thereof, radial cutters secured to the said cutter-bars, a vertical driving-shaft for operating said cutter-bars, a bevel-gear on said vertical shaft,a bevel-pinion on said horizontal sha-ft meshing with said bevel-gear, two bearing-blocks for said horizontal shaft pivoted respectively to the motor and miningmachine axially with respect to said vertical shaft, together with a vertical jack-post and means for journaling said post to the right side of the machine when making the leftcorner rotary cut and to the left side of the machine-frame when making the right-corner rotary cut, and means for moving the miningmachine upon said pivoting jack-post when making said cuts, substantially as and for the purpose specified.

8. The combination with a vertical shaft having a bevel-gear secured thereto, a bearing-piece in two parts which are pivotally connected by a horizontal pivot, one of said parts being pivoted axially with relation to said vertical shaft, the other having a horizontal orifice adapted to serve as a shaft-bearing, a shaft journaled and adapted to slide longitudinally thereon, a bevel-gear on said shaft, a tongue and groove connection be- IOO IIO

tween said shaft and gear, and a yoke pivoted to said bearing-piece and extending around said gear, substantially as and for the purpose specified.

9. In a mining-machine7 a bearing-piece composed of two parts which are pivoted to gether by a horizontal pivot, one of said parts being provided with curved slots, bolts passing through said curved slots and through the other part whereby said parts are held to gether, one of said parts having` a vertical oriee adapted to set over a vertical shaft, the other part having a horizontal orifice adapted to serve as a shaft-bearing, substantially as set forth.

l0. In a mining-machine having a vertical main shaft, the combination of a bevel-gear secured thereto, a bearing-piece composed of two parts which are pivoted together, one of said parts having a vertical orifice which sets down over the upper end of said vertical shaft, the other part having a horizontal orifice adapted to serve as a shaft-bearing, one of said parts having curved slots,with bolts passing through said slots, and through the other piece, a shaft journaled in said horizontal orifice, a bevel-gear secured to said shaft, a shoulder on the upper end of the vertical shaft, and a spring between said shoulder and bearing-piece, and means for supporting the other end of said shaft and for revolving said shaft, substantially as and for the purpose specified.

ll. In a mining-machine, a main frame, a capstan 'mounted thereon having a worm wheel, a wormfshaft and a ratchet-wheel on said shaft, combined with a vibrating cutterbar frame, two pawls adapted to engage with said ratchet-wheel, and suitable connections between said pawls and cutter -bar frame whereby the ratchet-wheel is moved by one pawl when the said frame moves in one direction and by the other pawl when it moves in the other direction, substantially as set forth.

l2. In a mining-machine, in combination, a frame and means for moving the same, a revoluble cutter-bar carried by said fralne and having a series of cutters projecting from its side, one of which cutters projects farther than the others, whereby it cuts a groove in the floor as the frame is moved and the cutter-bar revolved, mechanism for revolving the cutter-bar and tongues secured to the frame projecting downward therefrom, and adapted to slide in the groove cut as described, whereby the frame in its forward movement is guided by the groove made during the preceding movement, substantially as specified.

13. In a mining-machine, adapted to be moved bodily along the floor of the room, in combination with the main frame, tongues projecting downward from the under side of said frame and adapted to engage in a groove in the iioor, substantially as and for the purpose specified.

14:. In a mining-machine, the combination with the movable frame, of a side bar having tongues on its under side, and means for removably connecting said bar at one side of the frame at right angles thereto, substantially as and for the purpose specified.

l5. In a mining-machine, in combination, a frame having in each of its sides a vertical hole adapted to receive a pivoting jack-post, a rotary cutter-bar journaled in and projecting out from one end of said frame, cutters secured to said bar, one cutter being longer than the other whereby a groove is cut in the iioor of the kerf, a jack-post adapted to enter either the hole on the right side of the frame and to pivot said frame for use when cutting a kerf to the left, or the hole in the left side to pivot said frame when the machine is cutting a korf to the right, tongues upon the under side of said frame which lie and move in a guide-groove in the floor, and mechanism for revolving the cutter-bar and moving the frame.

lo. In a mining-machine, a main frame, a cutter-bar frame having a forward1y-cxtcnd ing arm, a revolving cutter-bar journaled on said frame at its rear end and to said arm at its forward end, combined with a rudder pivoted to said arm, and mechanism for operating said rudder, substantially as and for the purpose specified.

17. In a mining-machine, a main frame, a cutter-bar frame havin g aforwardly-extended arm, and a cu tter-bar journaled on said frame at its rear end and on the said arm at its forward end, combined with a shaft j ourn aled at its forward end to said arm and at its rear end to the main frame, a rudder secured to said shaft and mechanism secured to the main frame for operating said shaft, substantially as and for the purpose specified.

1S. In a mining-machine, a cuttenbar frame having a slant-ing apron at its forward end, a cutter-bar and a screw conveyer journaled to said frame and extending through and forward from said apron, substantially as set forth.

1). A miningmachine having on both sides of its longitudinal central line vertical orifices through which a pivoting jack-screw is adapted to pass, whereby the entire machine may be pivoted from its right side when working in the left side of the room and from its left side when working in the right side of the room, substantially as sct forth.

CHARLES O. PALMER. IVitnesses:

E. L. THUnsroN, FRANK. MILLER.

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